Stone-mason&#39;s hammer.



No. 689,48l. Patenterl Dec. 24,1901.

- A. GADE.

STONE MASON'S HAMMER.

(Application flied J'uXy 12,1901.)

(in Model.)

zA zwwau UNITED STATES ATENT OFFICE.

ALBERT GADE, OF DROSSEN, GERMANY.

STON E-MASO NS HAMMER.

SPECIFICATION forming part of Letters Patent No. 689,481, dated December1 01- Application filed July 1 2, l 90 1.

To all whom, it may concern.-

Be it known that I, ALBERT GADE, stonecutter, residing at Drossen,Prussia, in the Empire of Germany, have invented Improvements inStone-Masons Hammers, of which the following is a specification.

The presentinvention relates to a new granulating-hammer for facing thesurface of granite, marble, sandstone, and similar surfaces. 7

Facing-hammers as generally employed rapidly become blunt andineffective and require continual resharpening in order to -maintainthem in a serviceable condition.

My new hammer, on the contrary, does not blunt, and therefore requiresno such subsequent sharpening. This result is obtained through a newconstruction of the hammerhead.

Prior granulating hammers comprise a head composed of solid metal, onthe working surface of which teeth or cutting edges are formed byfiling, countersinking, or the like; or in some cases the teeth orcutting edges are made of removable strips separately from the headproper and secured to the face of the latter. My new hammer, on theother hand, differs from such constructions in that the head contains,essentially, a number of longitudinally-running channels the extremitiesor ends of the walls of which form the teeth or cuttingedges.

My new invention is illustrated by the annexed drawing, in which thefigure shows .a perspective View of the improved hammer.

The hammer-head A instead of being formed of a solid piece of metalcontains a group of channels a, separated by partitionwalls I). Thechannels maybe of any desired $srial No- 68,067. (N0 model.)

working face throughout the whole length of the head. The ends of thepartition-walls I) form the teeth or cutting edges of the hammer. Theeye a for the helve d may receive a socket of sheet metal e for thepurpose of preventing undue wear of the end of the Wooden helve.

My new hammer may be manufactured in the ordinary manner. Forexample,the metal employed may be crucible cast-steel cast in anysuitable mold and then rolled on the wellknown tube-rolling system.

For working granite the walls I), if about one or one and one-halfmillimeters thick, will be found to afford a sufficiently sharp edge.For marble and sandstone the walls should be somewhat thinner. a

In the drawing channels of square crosssection are shown; but I do notconfine myself to such precise form nor to any definite number ofchannels nor to the particular shape of hammer-head shown.

Having now described my invention, I claim as new and desire to secureby Letters Patent- A hammer comprisinga head containing a number oflongitudinal channels running at right angles to the Working face, theends of the walls dividing said channels forming cutting edges or teeth,substantially as and for the purpose hereinbefore set forth.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

' ALBERT GADE.

Witnesses:

WOLDEMAR I-IAUPT,

HENRY HA SPER.

cross-section and run at right angles to the 40

